Ti3AlC2掺杂SPS法制备Ti2AlC/TiAl复合材料的研究

通过2TiC-Ti-1.2Al体系的原位热压反应制备了Ti₃AlC₂陶瓷,然后以59.2Ti-30.8Al-10Ti₃AlC₂(wt%)为反应体系,采用放电等离子烧结技术制备出Ti₂AlC/TiAl基复合材料。借助XRD、SEM分析了产物的相组成和微观结构,并测量了其室温力学性能。结果表明：原位热压烧结产物由Ti₃AlC₂和TiC相组成,Ti₃AlC₂呈典型的层状结构,TiC颗粒分布在其间。SPS法制备的Ti₂AlC/TiAl基复合材料主要由TiAl、Ti₃Al和Ti₂AlC相组成,Ti₂AlC增强相主要分布于基体晶界处,表现为晶界/晶内强化作用。力学性能测试表明：Ti₂AlC/TiAl基复合材料的密度、维氏硬度、断裂韧性和抗弯强度分别为3.85 g/cm₃、5.37 GPa、7.17 MPa?m_1/2和494.85 MPa。

Study on Ti2AlC/TiAl composites with doping Ti3AlC2 by SPS

Ti₃AlC₂ ceramics were fabricated by in-situ reaction in the 2TiC-Ti-1.2Al system. Ti₂AlC/TiAl composites were prepared by spark plasma sintering technology in the 59.2Ti-30.8Al-10Ti₃AlC₂(wt%) system. The phase composition and microstructure of the specimens were analyzed by XRD and SEM methods. The room temperature mechanical properties were also measured. The results revealed that the in-situ Ti₃AlC₂ materials mainly consisted of Ti₃AlC₂ and TiC phases. Ti₃AlC₂ ceramics present layered structure and TiC particles distribute around the grain boundaries. The Ti₂AlC/TiAl composites prepared by SPS mainly consist of TiAl, Ti₃Al and Ti₂AlC phases. Ti₂AlC reinforcements are mainly distributed in the matrix grain boundaries, which show grain-boundary strengthening or intracrystalline strengthening effect. The density, Vickers hardness, fracture toughness and flexural strength of the Ti₂AlC/TiAl composites are 3.85 g/cm₃, 5.37 GPa, 7.17 MPa, 7.17 MPa?m_1/2 and 494.85 MPa respectively.